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Optim Energy (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Jan. 31, 2010
Interest Rate Swap [Member]
Optim Energy [Member]
Jun. 30, 2011
Optim Energy [Member]
Jun. 30, 2010
Optim Energy [Member]
Jun. 30, 2011
Optim Energy [Member]
Jun. 30, 2010
Optim Energy [Member]
Jan. 07, 2011
Optim Energy [Member]
Dec. 31, 2010
Optim Energy [Member]
Schedule of Equity Method Investments [Line Items]                        
Equity Method Investment, Ownership Percentage             50.00%   50.00%      
Derivative, Fixed Interest Rate                     1.33%  
Commitments and Contingencies             $ 0   $ 0      
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract]                        
Operating revenues             77,315,000 86,871,000 151,248,000 192,465,000    
Cost of energy             54,908,000 61,235,000 112,875,000 138,532,000    
Gross margin             22,407,000 25,636,000 38,373,000 53,933,000    
Non-fuel operations and maintenance expenses             9,408,000 6,450,000 18,651,000 16,970,000    
Administrative and general expenses             6,356,000 4,944,000 13,293,000 10,556,000    
Depreciation and amortization expense             13,126,000 12,852,000 24,739,000 24,909,000    
Taxes other than income tax             2,347,000 3,162,000 4,717,000 6,596,000    
Operating income (loss)             (8,830,000) (1,772,000) (23,027,000) (5,098,000)    
Interest charges             (3,981,000) (4,661,000) (7,965,000) (9,332,000)    
Other income (deductions)             195,000 2,000 263,000 66,000    
Earnings (loss) before income taxes             (12,616,000) (6,431,000) (30,729,000) (14,364,000)    
Income taxes             94,000 [1] 36,000 [1] 141,000 [1] 68,000 [1]    
Net earnings (loss)             (12,710,000) (6,467,000) (30,870,000) (14,432,000)    
50 percent of net earnings (loss)             (6,355,000) (3,234,000) (15,435,000) (7,216,000)    
Amortization of basis difference in Optim Energy             0 (624,000) 0 (994,000)    
Post-impairment loss not recorded under GAAP             6,355,000 0 15,435,000 0    
PNMR equity in net earnings (loss) of Optim Energy 0 (3,858,000) 0 (8,210,000)     0 (3,858,000) 0 (8,210,000)    
Equity Method Investment, Summarized Financial Information, Assets [Abstract]                        
Current assets             102,851,000   102,851,000     105,413,000
Net property plant and equipment             908,666,000   908,666,000     924,354,000
Other long-term assets             112,196,000   112,196,000     120,894,000
Total assets             1,123,713,000   1,123,713,000     1,150,661,000
Equity Method Investment, Summarized Financial Information, Liabilities [Abstract]                        
Current maturities of long-term debt             717,000,000   717,000,000     0
Other current liabilities             52,220,000   52,220,000     50,226,000
Long-term debt             0   0     717,000,000
Other long-term liabilities             9,397,000   9,397,000     7,515,000
Total liabilities             778,617,000   778,617,000     774,741,000
Equity Method Investment Summarized Financial Information, Equity [Abstract]                        
Owners’ equity             345,096,000   345,096,000     375,920,000
50 percent of owners’ equity             172,548,000   172,548,000     187,960,000
PNMR basis difference in Optim Energy             193,000   193,000     216,000
Impairment of equity investment in Optim Energy             (188,176,000)   (188,176,000)     (188,176,000)
Post-impairment loss not recorded under GAAP             15,435,000   15,435,000     0
PNMR equity investment in Optim Energy             0   0     0
Notional Amount of Interest Rate Cash Flow Hedge Derivatives           650,000,000            
Equity Method Investment, Summarized Financial Information, Amortization of Contracts Acquired             3,700,000 4,200,000 7,300,000 8,200,000    
Equity Method Investment, Summarized Financial Information, Amortization of Emission Allowances             $ 1,600,000 $ 1,300,000 $ 4,100,000 $ 2,600,000    
[1] Represents the Texas Margin Tax, which is considered an income tax under GAAP.